Question

domain : ______
range : ______

Explanation:

The domain of a graph is all x-values the graph covers. The vertical line here is at $x=6$, so only this x-value is included. The range is all y-values the graph covers; the vertical line extends infinitely downward and upward, so all real y-values are included.

Answer:

Domain: $\{6\}$
Range: $(-\infty, \infty)$ (or all real numbers)